Bug 884410 - Handlify JS_GetPrototype. r=terrence
Bug 884410 - Handlify JS_SetPrototype. r=terrence
Bug 899801 - Don't keep more than five "momentums" values in BrowserElementPanning.js. r=vingtetun

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extra : rebase_source : f9285a4208b307713d707e5750f39eb43c2b126c